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RE: Low-Profile Focusser Problem

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Posted by Rick Crockett on July 29, 2000 16:22:12 UTC

Hi Dennis:

I am sure your problem is not with the focuser but on question is why get a low profile focuser if you didn`t need it? Anyway ther is nothing wrong with using extention tubes unless they vignette your field. Unless the focuser and extention tube are not square, I can`t see how they are your problem. Sounds to me like it is your optics. In fact if the optics were once good it sounds like either the diagonal or mirror is under stress or was under stress and yielded. If your diagonal plate that supports the glass has a push pull alignment as most do, it is possible to warp the plate and stress the optic. Check the push screws, they should just barely touch till there is no wobble. On the main mirror cell I like to use a soft piece of cork or foam under the retaining clips and then tighten them in place with only the weight of the tiny clip itself against the mirror. For cheaper cells that might flex and bind or move due to humidity, I would go with Bob`s suggestion of no contact at all between mirror and clip. My first suspicion assuming the optics were good is the diagonal holder.

Good Luck,
-Rick

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